I get them all the time from straps. Red lines, slight bruises. Never looked like dirt though.....People always just ask me..." Are you alright?!" ..."What happened?!" thinking whatever,....I laugh..... Now at times it does get irrating (the slight pain sometimes/burn) so I went to Sports Authority and got myself a pair of white wristbands. Also, when you wash your wraps, make sure you use fabric softener. if you don't they get hard as Fuk@! Like burlap. Ouch.